Thomas thompson



@uiten gratte yiggatrrtt @ffii-rr.

Lena-s, Parent No. 81,435, ma August 25,1868.

'IMPRQVEMENT IN SHINGLE-BOLT MACHINES.

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VTO ALL WHM .IT MAY CON CERN:

Be it known that I,.THOMAS THOMPSON, of the city of Buffalo; countyofErie, and State of New York', have invented a certain'new andvimprovedvShingle-Bolt Machine; and-IA do hereby declare that' the following isafull, clear, and exact description thereof, reference being :had to theaccompanying drawings, making a part of this specification, in whichi. l

Figure I is a side elevation ofthe machine,

Figure II is a front elevation, and

Figure III is a top plan View thereof. j

In this machine, the block to be cut intobolts is supported on end upona-liorizontal table, and t'he bolting saw 'cuts down through the samevertically and longitudinally; my invention relating- First, to themechanism by which thesa'w is supported, driven, and fed to and from itswork, said mechanism consisting essentially of a counterbalancedswinging frame, carrying the bolting-saw, and a reversing pfriction-feed apparatus, whereby the saw-frame may be raised andlowered, as required.

Second, to the combination and arrangement of a step-lever and pivot-armwith a stationary table, up through the centre of which the latter isprojected, so as to facilitate the turning'of the block on the table topresent its different sides te the action of the saw in dividing it intobolts- .In the accompanying drawings, like letters refer to like partsin each of the figures. v

The main framing ofthe machine consists of a front frame,- A, composedof two vertical posts, with sill .and cap, and'supportingl thevfeeding-mecha-mism; a back frame, B, also composed of twoverticalposts, withvsill .and cap, and supporting the driving-shaft'andswinging-saw frame, said frames, A'and B, being connected together bystraining-sills A and braces B'.

The swinging-saw frame consists of two parallel arms or timbers, C,connected together by cross-pieces C4', and hinged at one end to themain drivingshaft D, and carrying at its other or swinging end'(whichprojects thronghand beyond the front frame A) the bOlting-saw E.

The block-table F is arrange'd partially beneath the saw,.with'itscentre vertically in line with the cuttingedge of the saw,'whle itssurface is made level with the centre of the driving-shaft. The tablemay be sup ported inV any suitable manner, and is provided' with a slitin the side next to the saw for the passage of theA latter as itdescends through the block 'arranged thereon, as yshown in Fig I II.

By this arrangement, the eut of tho saw-is at right angles, or nearlysc,` to thc table, so that the blockl requires no clogging or clampingto the table to hold it against the cutof the saw,-

Underneath the table F is arranged a step-lever, M", with an arm, M,restingon one end, projecting upward 'through a holein the centre of thetable. The upper end of this arm is made pointed,'with the centre.ofithe` block resting thereon. When the block is required to be turnedto present adiiferent-sidejto the actionof the saw, the foot is appliedto thc step-lever. which forces -the arm M upward underfthecentre of theblock, raising the latter from the surface of the table, and supportingit on the pointed end oi' the arm, which, operating as a pivot,cnablcsrthc block to be rotated with great easo`and facility.

The saw is driven from tho main shaft D by 'a belt, D, leading from thepulley Dz thereon to the pulley E on the saw-shaft, so that theup-and-down swinging of the saw, being upon said driving-shaft as acentre,`does not aifect the tension of its driving-belt.

The feeding-mechanism, by which the sawis swung up and down, is arrangedas follows:

G is a transversc'shaft, supported in proper journal-bearings by thefront frame A, and above the limit of .the upward movement of thesaw-frame. G G are twcpinions upon shaft G, which take hold of tworacks, H, projecting up from and hinged to the side arms of thesaw-frame.- I is a groovcd frictionspulley on thc end of shaft G. `J isa conntershaft labove siiaft'G, and parallel thereto, carrying a pulley,Jl, at one end, driven from thepulley J2 en the main shaft D by thecrossed belt J3. l

J* is a fridtion-wheel on opposite end ofshaft J, working iu the'grooved frilctionwheel I. `The bearing of the shaft J, contiguous to itsdriving1pulley,'is made stationary in the postof the frame A, while itsbearing, contiguous to its friction-wheel, is made movable, andconnected by the rod K with the lever K', so that by a moi'ement ofthelever the frietionwheelJ may be thrown into contact .with either theouter or inner periphery of the grooved friction-wheelI.

When thrown in contact with the outer peripherylof whcelI, the shaft Gwill he driven in such direction as will, through the medium of thepnions G and racks H, feed the saw-frame downward, and cause the saw tocut its way regularly and with proper speed through the block.`

When the friction-wheel d" isthrown in contact with the inner peripheryof the grooved wheel I, the motion of the shaft G will be reversed, sothat the saw-frame will' be raised andthe saw withdrawn from the block;

this upward movement, owing to the smaller diameter on which wheel J4acts, being much faster than the downward movement, which exactly meetsthe requirements of the case, since the saw has no labor to performduring its upward movement. d

The weight of thev swinging-saw frame and its attendant parte iscounterbalanced by the weights L, hung to ropes L, passing over sheaves,L, in the cap of the front frame, and connected to the side arms of theframe.

This counterhalancing of the saw-frame makes the feeding-movement of thesame easy, and retains it at any point' desired without fastening.

The block to be cut into bolts is placed upon the table, with its centrocoincident, or nearly so, with that.

of the table, so that the rst passage of the saw through it will onlycut into its centre,.or only half divide it. It is thenturned a quarterway round, more or less, and a second cut made similar to the rst, andin the same manner a third and fourth, thus dividing the block intobolts ot'` the required size.

Commonly theseveral cuts are not allowed to quite meet, each other, sothat theblock will hold together until all the cuts are made, when thoconcussion incident to the throwing down of the block from the tablewill complete the separation.

The general arrangement of the machine is one of great convenience,simplicity, and durability, and performs its work with great rapidityand small waste of power.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. The arrangement of the rack-bars H, pinions G', friction-wheels I'and J, and shifting-rod and lever K K', with the counterbalanoodswinging-saw frame C, as a means of raising and lowering the same, asset forth.

2. vThe step-lever M and pivot-arm M, in combination with the stationarytable F, provided with a slit in one side for the passage of the saw,arranged and operating in the mann-cr, for the purpose described.

THOS. THOMPSON. Witnesses Einw. WILHELM, W. H. Fonnnsn.

